Sugar Act 1764- England was in debt from the French and Indian War, so they decided a great way to make money would be to have the American Colonies pay a tax. Why not? It was the reason England was in debt, trying to defend the colonial land.
This didn't seem to make the colonist to angry, and England still needed money, so in 1765 they passed the Stamp Act. This was a tax on paper items like newspapers, diplomas, prayer books, etc...
This made the colonists very upset, so a group got together and wrote a petition against the act, which they sent to the British parliament. These leaders were known as the stamp act congress, and they demanded the tax be repealed.
In response the British did repeal the act, but established The Declaratory Act, which told the colonial that England was the ruler of them, and they better do what they were told to do.
The British still needed money, so they instituted the Townsend Act in 1767. This act forced the colonists to have British soldiers stay in their houses, pay taxes on imported goods, and allowed the British to search for smuggled in colonial homes and businesses.
In March 1770, the colonist in Boston were yelling at the soldiers in front of the Boston Customs House, and started throwing snowballs. A snowball hit a soldier, and the soldiers started firing at the crowd. Five American colonists were killed, the first being an African American named Crispus Attucks. This was the unifying event within the colonies against the British. This became known as the Boston Massacre.
"Afro-American Monument," ca.1897. Prints and Photographs Division, Library of Congress. Reproduction Number LC-USZC4-2329.